Setup advice needed

[RC John]

I ran my DEX410R for the first time last night. Handling was pretty good, but I can definitely use more on power rear traction. Off power grip is good, but getting on power was trickly. Unless I was very smooth with the throttle, I would spin out coming out of corners.
I'm currently running 7k/5k diff oils. I was thinking of going thinner like 2k rear, or perhaps 2k all around. Would this help with on power grip?